[PATCH] mac80211: don't allow scanning in monitor mode

zd1211rw gets confused when the user asks for a scan when the device is
in monitor mode. This patch tightens up the SIWSCAN handler to deny the scan
under these conditions.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index d0e1ab5..e7904db 100644 (file)
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -697,17 +697,24 @@ static int ieee80211_ioctl_siwscan(struct net_device *dev,
        if (!netif_running(dev))
                return -ENETDOWN;
 
-       if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
-               if (sdata->type == IEEE80211_IF_TYPE_STA ||
-                   sdata->type == IEEE80211_IF_TYPE_IBSS) {
+       switch (sdata->type) {
+       case IEEE80211_IF_TYPE_STA:
+       case IEEE80211_IF_TYPE_IBSS:
+               if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
                        ssid = sdata->u.sta.ssid;
                        ssid_len = sdata->u.sta.ssid_len;
-               } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
+               }
+               break;
+       case IEEE80211_IF_TYPE_AP:
+               if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
                        ssid = sdata->u.ap.ssid;
                        ssid_len = sdata->u.ap.ssid_len;
-               } else
-                       return -EINVAL;
+               }
+               break;
+       default:
+               return -EOPNOTSUPP;
        }
+
        return ieee80211_sta_req_scan(dev, ssid, ssid_len);
 }